Question

Which of the following ores cannot be concentrated by magnetic separation?

• A. Haematite
• B. Malachite
• C. Magnetite
• D. Siderite

Answer 1

The correct option is B Malachite

• Magnetic separation based on differences in magnetic properties of the ore components.
  
• If either the ore or the gangue is attracted towards the magnetic field, then the separation is carried out by this method.
• For example, iron ores are attracted towards the magnet, hence, non–magnetic impurities can be separated from them using magnetic separation.
• Here, Haematite, Magnetite, and Sidderite are iron ores and hence magnetic separation can be used to separate them.
• Malachite is a Copper ore and hence magnetic separation can't be used to concentrate it.